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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Stepan Koltsov
*/
package scala.tools.nsc
package interpreter
import java.io.IOException
import session.History
import InteractiveReader._
import Properties.isMac
/** Reads lines from an input stream */
trait InteractiveReader {
def postInit(): Unit = {}
val interactive: Boolean
def reset(): Unit
def history: History
def completion: Completion
def redrawLine(): Unit
def readYesOrNo(prompt: String, alt: => Boolean): Boolean = readOneKey(prompt) match {
case 'y' => true
case 'n' => false
case -1 => false // EOF
case _ => alt
}
protected def readOneLine(prompt: String): String
protected def readOneKey(prompt: String): Int
def readLine(prompt: String): String =
// hack necessary for OSX jvm suspension because read calls are not restarted after SIGTSTP
if (isMac) restartSysCalls(readOneLine(prompt), reset())
else readOneLine(prompt)
}
object InteractiveReader {
val msgEINTR = "Interrupted system call"
def restartSysCalls[R](body: => R, reset: => Unit): R =
try body catch {
case e: IOException if e.getMessage == msgEINTR => reset ; body
}
def apply(): InteractiveReader = SimpleReader()
@deprecated("Use `apply` instead.", "2.9.0")
def createDefault(): InteractiveReader = apply() // used by sbt
}
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